Facts

Nacho Monreal scored for Arsenal after 25 minutes before Wayne Rooney equalised almost immediately with a header from Angel Di Maria's cross. Danny Welbeck put Arsenal back in front on 61 minutes after Antonio Valencia's terrible back pass. Di Maria was sent off on 74 minutes, booked first for diving then grabbing referee Michael Oliver's shirt moments later.

Analysis

A game United threw away. Welbeck's goal was an awful one to concede and any hope they had of getting back into the game disappeared when Di Maria was stupidly sent off. It was an even more ridiculous dismissal than Chris Smalling's at Manchester City. And that's saying something.

Main man

It would have been Di Maria had he not got himself sent off. He had a good first half after disappointing games against Sunderland and then Newcastle. It was a wonderful cross for Rooney's equaliser, one of the best you'll see all season and he was finally starting to look like the player who was brilliant in last season's Champions League final. Then he got himself sent of in ridiculous circumstances.

Bigger picture

United are out. They had a great chance of winning it this season after Chelsea and Manchester City were knocked out and their exit to Arsenal was all of their own making. Van Gaal is under even more pressure to finish in the top four now. And that's by no means guaranteed.